Stars & Galaxies 2

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Across
  1. 2. The most luminous, most massive stars, with diameters greater than 100 times the diameter of our Sun
  2. 8. A halo of gasses that is formed by the expelled layers of a star’s atmosphere
  3. 10. The final life stage of an extremely massive star, with a gravitational field so intense that not even light can escape
  4. 11. The Super dense remains of a massive star that collapsed with enough Force to push all of its electrons into the nuclear they orbit resulting in a mass of neutrons
  5. 12. A distant neutron star that emits rapid pulses of light and radio waves instead of steady radiation
  6. 13. The remnant of a giant star that has lost its outer atmosphere; the glowing stellar core
Down
  1. 1. A star that is at the point in its life cycle in which it is actively fusing with hydrogen nuclei into helium nuclei; also the band of the Hertzsprung-Russell diagram depicting such stars
  2. 3. A group of millions, or even billions, of stars held together by gravity
  3. 4. theory holding the Universe originated from an instant expansion of an extremely small concentration of matter extremely high density and temperature
  4. 5. A very distant, extremely luminous celestial object that scientists considered to be a type of active galactic nuclei
  5. 6. Large star with great luminosity and a diameter 10-100 times greater than that of the Sun
  6. 7. Brilliant burst of light that follows the collapse of the iron core of a massive star
  7. 9. A large cloud of dust or gas in space